IRS keeps rejecting the return saying the previous year AGI is not accurate but it is accurate based on the return filed last year. What besides paper filing can I do?

[mesquitebean]

If the 2017 return was filed real late in the year, such as November 2018 or later, you can try an AGI of 0 (zero).   

Be sure you are using the AGI from the original 2017 return, not an amended one.

If a joint return, both spouses use the same total AGI.  Do not divide or allocate it.

If you want to see if you can download a 2017 tax return transcript from the IRS website, you can see what it shows for your 2017 AGI.   If you're eligible to open the free account there, you can download one right away.    If you don't qualify to open an IRS account, you can order one to come by postal mail, which normally takes 5-10 calendar days.  
http://www.irs.gov/Individuals/Get-Transcript

See this FAQ:
https://ttlc.intuit.com/questions/3415597-what-if-i-entered-the-correct-agi-and-i-m-still-getting-an...

[mesquitebean]

If you know the Self-Select PIN  you used last year,  you could try efiling with the PIN instead of the AGI.   Be sure to enter it in the PIN field, not the AGI field.